Antenna structure



FIG. 1 is a perspective view of an antenna structure showing my newdesign;

FIG. 2 is an inverted rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a front elevational view thereof; and,

FIG. 7 is a bottom plan view thereof.

The portions shown in broken lines are for illustrative purposes onlyand do not form any part of the claimed design.

The ornamental design for an antenna structure, as shown and described.